Table 9.
Periods of PG 1351 available for the asteroseismological analysis.
 |
 |
Πℓ, k | ℓ | k | δΠℓ, k |
 |
Unstable |
|---|---|---|---|---|---|---|---|
| (s) | (s) | (s) | (s) | (10−13) s/s | |||
| REA11 | TESS | ||||||
| 335.26 | 336.81 | 2 | 13 | −1.55 | 0.60 | Yes | |
| 489.33 | 489.26 | 489.47 | 1 | 11 | −0.21 | 0.81 | Yes |
| 584.68 | 586.99 | 2 | 25 | −2.31 | 1.02 | Yes | |
| 639.63 | 639.37 | 1 | 15 | 0.26 | 1.19 | Yes |
Notes. Column 1 corresponds to four ℓ = 1 periods measured by Redaelli et al. (2011; REA11), and Col. 2 corresponds to the single period detected by TESS (Table 3). The third, fourth and fifth columns give the theoretical periods of the asteroseismological model of PG 1351, the harmonic degree and the radial order, respectively. Columns 6 and 7 correspond to the period difference (
) and the rate of period change, respectively. Finally, the last column provides information about the pulsational stability or instability nature of the modes.
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